Practical set: has prepared 200 insulation plates washers for you, with an inner diameter of 0.58 cm and an outer diameter of 3.5 cm, washers suitable for most plasterboard on the market. The quantity is sufficient to meet your different requirements High-quality material: washers are made of high-quality galvanised iron, durable and resistant to rust and deformation. Stainless steel washers are characterised by earthquake resistance, weather resistance, moisture resistance, cold and heat resistance as well as corrosion resistance. Suitable for various wall materials. Unique design: insulation plates have a unique design that increases contact surface with the wall, increases load capacity and pressure resistance and significantly reduces the risk of surface peeling or damage. Insulation plates provide comprehensive protection for the wall and are ideal choice for attaching back walls and insulation panels to most common floor and wall materials! Areas of application: washers are suitable for various wall materials, including thermal insulation boards, tile backwalls, plasterboard, composite panels and extruded panels. Washers can also be used directly to attach building materials to frames and provide easy and secure support for attaching backboards and insulation panels to floor or wall. Easy installation: After attaching the washers with screws, the insulating discs hold firmly to the surface, with the edge of the discs flush with the surface of the plates. In addition, the hole design on the mounting discs helps glue or mortar to stick to the surface of the plates and reduces the risk of surface peeling or damage to a minimum. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.